Try rebooting your device, resetting your network connections, toggle in airplane mode, on and off, and removing then re-inserting the Sim card in the device.The "7B1" error after a number port typically indicates a network activation issue. It means your phone monkey type isn't fully connected to the new network, even though you've ported your number. Troubleshooting steps include restarting your phone, checking Airplane mode, verifying carrier settings and iOS updates, and potentially resetting network settings. If the issue persists, contacting your carrier for support is recommended.
